Hi, I believe the NYC DOB form you need is the PW1. Section 26A of that form is for co-op signature, where the co-op attests that they have reviewed and approved the proposed project. In order for the co-op to evaluate the project, you should be prepared to submit plans, references, licenses, budgets, tenant protection plans, covid safety plans, etc. -- whatever materials the co-op needs to feel comfortable with your proposed alteration in order to sign the PW1. That said, based on what you wrote, you may wish to reconsider your architect. Co-op renovations are unique given that shareholders do not own their walls or inside them (check your lease), and technically do not even own their units (instead, own shares in the co-op). An architect who does not understand this (apparently yours does not, based on the forms given to date) may not be sufficiently knowledgeable about co-op alterations to successfully complete the project.